1 MHz to 10 GHz, 55 dB Log Detector/Controller Data Sheet AD8317 FEATURES FUNCTIONAL BLOCK DIAGRAM VPO S TADJ Wide bandwidth: 1 MHz to 10 GHz High accuracy: 1.0 dB over temperature GAIN SL O PE 55 dB dynamic range up to 8 GHz 3 dB error BI AS IV VSET Stability over temperature: 0.5 dB Low noise measurement/controller output, VOUT VOUT IV Pulse response time: 6 ns/10 ns (fall/rise) DET DET DET DET CL PF Small footprint, 2 mm 3 mm LFCSP INHI Supply operation: 3.0 V to 5.5 V at 22 mA INLO Fabricated using high speed SiGe process CO MM APPLICATIONS Figure 1. RF transmitter PA setpoint control and level monitoring Power monitoring in radio link transmitters RSSI measurement in base stations, WLANs, WiMAX, and radars GENERAL DESCRIPTION The AD8317 is a demodulating logarithmic amplifier, capable The feedback loop through an RF amplifier is closed via VOUT, of accurately converting an RF input signal to a corresponding the output of which regulates the output of the amplifier to a decibel-scaled output. It employs the progressive compression magnitude corresponding to VSET. The AD8317 provides 0 V to technique over a cascaded amplifier chain, each stage of which (VPOS 0.1 V) output capability at the VOUT pin, suitable for is equipped with a detector cell. The device can be used in either controller applications. As a measurement device, VOUT is measurement or controller modes. The AD8317 maintains externally connected to VSET to produce an output voltage, accurate log conformance for signals of 1 MHz to 8 GHz and V , that is a decreasing linear-in-dB function of the RF input OUT provides useful operation to 10 GHz. The input dynamic range signal amplitude. is typically 55 dB (referenced to 50 ) with less than 3 dB The logarithmic slope is 22 mV/dB, determined by the VSET error. The AD8317 has 6 ns/10 ns response time (fall time/rise interface. The intercept is 15 dBm (referenced to 50 , CW time) that enables RF burst detection to a pulse rate of beyond input) using the INHI input. These parameters are very stable 50 MHz. The device provides unprecedented logarithmic intercept against supply and temperature variations. stability vs. ambient temperature conditions. A supply of 3.0 V The AD8317 is fabricated on a SiGe bipolar IC process and is to 5.5 V is required to power the device. Current consumption is available in a 2 mm 3 mm, 8-lead LFCSP with an operating typically 22 mA, and it decreases to 200 A when the device is temperature range of 40C to +85C. disabled. The AD8317 can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin. Because the output can be used for controller applications, special attention has been paid to minimize wideband noise. In this mode, the setpoint control voltage is applied to the VSET pin. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20052019 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 05 54 1-0 01AD8317 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Input Signal Coupling ................................................................ 11 Applications ....................................................................................... 1 Output Interface ......................................................................... 11 Functional Block Diagram .............................................................. 1 Setpoint Interface ....................................................................... 11 General Description ......................................................................... 1 Temperature Compensation of Output Voltage ..................... 12 Revision History ............................................................................... 2 Measurement Mode ................................................................... 12 Specif icat ions ..................................................................................... 3 Setting the Output Slope in Measurement Mode .................. 13 Absolute Maximum Ratings ............................................................ 5 Controller Mode ......................................................................... 13 ESD Caution .................................................................................. 5 Output Filtering .......................................................................... 15 Pin Configuration and Function Descriptions ............................. 6 Operation Beyond 8 GHz ......................................................... 15 Typical Performance Characteristics ............................................. 7 Evaluation Board ............................................................................ 16 Theory of Operation ...................................................................... 10 Die Information .............................................................................. 18 Using the AD8317 .......................................................................... 11 Outline Dimensions ....................................................................... 19 Basic Connections ...................................................................... 11 Ordering Guide .......................................................................... 19 REVISION HISTORY 9/2019Rev. C to Rev. D 8/2007Rev. 0 to Rev. A Changes to Table 6 .......................................................................... 18 Changes to f = 8.0 GHz, 1 dB Dynamic Range Parameter ........ 4 Updated Outline Dimensions ....................................................... 19 Changes to Table 2 ............................................................................. 6 Changes to Figure 20 ...................................................................... 10 Changes to Setpoint Interface Section and Figure 22 ................ 12 8/2017Rev. B to Rev. C Change to Figure 2 and Table 3 ...................................................... 6 Changes Figure 27 .......................................................................... 13 Updated Outline Dimensions ....................................................... 19 Changes to Table 5 .......................................................................... 17 Changes to Ordering Guide ......................................................... 19 Added Die Information Section ................................................... 19 Changes to Ordering Guide .......................................................... 21 3/2008Rev. A to Rev. B Changes to Features .......................................................................... 1 10/2005Revision 0: Initial Version Changes to General Description .................................................... 1 Changes to Measurement Mode Section ..................................... 12 Changes to Equation 12 ................................................................. 15 Rev. D Page 2 of 19